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Abstract

We present a systematic experimental study of the linear and nonlinear optical properties of silicon-germanium (SiGe) waveguides, conducted on samples of varying cross-sectional dimensions and Ge concentrations. The evolution of the various optical properties for waveguide widths in the range 0.3 to 2 µm and Ge concentrations varying between 10 and 30% is considered. Finally, we comment on the comparative performance of the waveguides, when they are considered for nonlinear applications at telecommunications wavelengths.

Figure of Merit as a function of the waveguide width for x = 0.1 (red circles), 0.2 (green triangles) and 0.3 (blue squares). The solid lines, corresponding to cubic polynomial fits, are only to guide the eye.